WO2007098893A1 - Procédé de fabrication d'une unité de mesure de la pression d'un fluide, et composant destiné à être utilisé dans ladite unité. - Google Patents

Procédé de fabrication d'une unité de mesure de la pression d'un fluide, et composant destiné à être utilisé dans ladite unité. Download PDF

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Publication number
WO2007098893A1
WO2007098893A1 PCT/EP2007/001592 EP2007001592W WO2007098893A1 WO 2007098893 A1 WO2007098893 A1 WO 2007098893A1 EP 2007001592 W EP2007001592 W EP 2007001592W WO 2007098893 A1 WO2007098893 A1 WO 2007098893A1
Authority
WO
WIPO (PCT)
Prior art keywords
housing member
chip
housing
measuring
providing
Prior art date
Application number
PCT/EP2007/001592
Other languages
German (de)
English (en)
Inventor
Bernd Beck
Jörg Weber
Original Assignee
Smiths Medical Deutschland Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Smiths Medical Deutschland Gmbh filed Critical Smiths Medical Deutschland Gmbh
Priority to DE502007002925T priority Critical patent/DE502007002925D1/de
Priority to EP07711654A priority patent/EP1989523B1/fr
Publication of WO2007098893A1 publication Critical patent/WO2007098893A1/fr

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G01L19/0007—Fluidic connecting means
    • G01L19/0023—Fluidic connecting means for flowthrough systems having a flexible pressure transmitting element
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M5/00—Devices for bringing media into the body in a subcutaneous, intra-vascular or intramuscular way; Accessories therefor, e.g. filling or cleaning devices, arm-rests
    • A61M5/14—Infusion devices, e.g. infusing by gravity; Blood infusion; Accessories therefor
    • A61M5/168—Means for controlling media flow to the body or for metering media to the body, e.g. drip meters, counters ; Monitoring media flow to the body
    • A61M5/16831—Monitoring, detecting, signalling or eliminating infusion flow anomalies
    • A61M5/16854—Monitoring, detecting, signalling or eliminating infusion flow anomalies by monitoring line pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/33—Controlling, regulating or measuring
    • A61M2205/3331—Pressure; Flow
    • A61M2205/3344—Measuring or controlling pressure at the body treatment site
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2230/00—Measuring parameters of the user
    • A61M2230/30—Blood pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M39/00—Tubes, tube connectors, tube couplings, valves, access sites or the like, specially adapted for medical use
    • A61M39/22—Valves or arrangement of valves
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • Y10T29/49144—Assembling to base an electrical component, e.g., capacitor, etc. by metal fusion
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49124—On flat or curved insulated base, e.g., printed circuit, etc.
    • Y10T29/4913—Assembling to base an electrical component, e.g., capacitor, etc.
    • Y10T29/49146—Assembling to base an electrical component, e.g., capacitor, etc. with encapsulating, e.g., potting, etc.
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49117—Conductor or circuit manufacturing
    • Y10T29/49169—Assembling electrical component directly to terminal or elongated conductor
    • Y10T29/49171—Assembling electrical component directly to terminal or elongated conductor with encapsulating

Definitions

  • the present invention relates to the technical field of fluid pressure measurement, and more particularly to the manufacture of a component of a fluid pressure measuring unit, such as e.g. those for blood pressure measurement by pressure transmission with the aid of a liquid column, such as the liquid in a pressure measuring tube or a pressure measuring line.
  • a component of a fluid pressure measuring unit such as e.g. those for blood pressure measurement by pressure transmission with the aid of a liquid column, such as the liquid in a pressure measuring tube or a pressure measuring line.
  • a blood pressure measurement has already been integrated into an infusion system, taking advantage of the fact that the fluid column from the arterial or venous catheter (not shown) to a pressure transducer can be used as a pressure transmission medium, if a sufficiently dimensionally stable tube between venous / arterial catheter.
  • the blood pressure is then transferred via the infusion solution from an artery or vein via the catheter and via said dimensionally stable tube to a special sensor which is designed, i m pressure swan Detect changes in the infusion solution, which then correspond to the measured blood pressure values.
  • a pressure sensor is also called a transducer.
  • FIG. 3 The basic structure of such an infusion system with the functionality of a blood pressure measurement is shown in FIG.
  • a system has an infusion solution bag 302, which is connected via an infusion solution hose 304 to a first tap or flushing system 102.
  • the flushing system is provided with a capillary which serves as a pressure decoupling of the other system components from the infusion solution bag 302.
  • the purge system 102 may be designed to provide a predefined flow rate of, for example, 3 ml per hour.
  • the first tap or flushing system 102 is connected to a transducer 100, which in turn may be connected to a second tap 104.
  • the second tap 104 is connected to the patient 311 via a pressure-stable pressure measuring line 310 (for example via a catheter).
  • a pressure-stable pressure measuring line 310 for example via a catheter.
  • the pressure measuring line 310 shown in FIG. 3 has a high dimensional stability, i. a low elasticity, should have, so as not to distort or dampen pressure fluctuations.
  • the second tap 104 is normally used for "zeroing", i.e., adjusting or calibrating the pressure to be measured at the transducer 100 by applying atmospheric pressure to the tap 104 of the transducer 100 when the patient is decoupled from the patient.
  • a known type of transducer in pressure measuring systems consists of several individual parts.
  • a typical structure of such a conventional transducer is shown in the cross-sectional view in FIG.
  • the conventional transducer has a housing lower part 402 (for example in the form of a cup), in which a prefabricated membrane 404 (for example made of silicone) is inserted.
  • a contact carrier 406 is placed, which has openings 408, are pressed into the socket contacts 410 with contact springs.
  • the housing bottom 402, the diaphragm 404, and the contact carrier 406 have a center hole 409 through which an atmospheric pressure of the external environment of the transducer abuts an upper portion of the contact carrier 406.
  • the contact springs are soldered to terminal contacts 412 on the ceramic plate 414, the contact terminals 412 being connected to contacts of a measuring chip 416.
  • the measuring chip 416 is arranged on a first side of the ceramic plate 414 via an opening in the ceramic plate 414, which is part of the center hole 409, whereas the connection contacts 412 are arranged on a first side opposite the second side of the ceramic plate 414.
  • an O-ring 415 is arranged between the contact carrier 406 and the ceramic plate 414, which laterally surrounds the opening 409 in the contact carrier 406.
  • an ambient air pressure is applied to the measuring chip 416 as a reference value for atmospheric pressure compensation via the center hole 409 or the opening in the ceramic plate 414.
  • sealing of the socket contacts or the electrical connections such as the connection contacts 412 or conductor tracks on the ceramic plate 414 against conductive fluids, such as the infusion solution or externally applied fluids, is provided by the O-ring 415, which may be connected when connecting the Transducers could penetrate into the interior of the housing.
  • the transducer has an upper housing part 418, which encloses a flow channel 420 for the infusion solution.
  • the measuring chip 416 is arranged in a recess of the flow channel 420.
  • the measuring chip is covered with a gel, which protects the measuring chip 416 from the infusion solution, since direct contact of the electrically conductive infusion solution with the measuring chip 416 would falsify the measurement results due to "leakage currents" in the electrically conductive infusion solution
  • gel pressure fluctuations in the fluid can be transmitted to the measuring chip 416.
  • the housing top 418 is connected to the housing bottom 402 at welds or splices 422 (eg, via ultrasonic welding) so that the transducer is fabricated in its final shape.
  • a connection of the transducer is now such that a plug or a connector 424 is passed through an opening in the bottom of the housing base 402 through the membrane 404 and electrically conductive with the contact springs of the socket contacts 410 is brought into connection.
  • the membrane 404 is already provided with slots which strip off any liquids on the connector pins when inserting the connector 424.
  • a possible manufacturing process includes, for example, the following steps.
  • the socket contacts 410 are pressed into the contact carrier 406. Subsequently, the O-ring 415 is placed on this provided with the socket contacts 410 contact carrier 406, whereupon the ceramic plate 414 (hybrid ceramic with printed conductors and resistors) on the O-ring 415th is hung up. On the ceramic plate 414, the measuring chip 416 is attached to the corresponding terminal contacts 412. After placing the hybrid ceramic on the O-ring 415 and the contact carrier 406 solder tails 411 of the socket contacts 410, which are pressed into the contact carrier, connected to the terminal contacts 412 of the hybrid ceramic and soldered.
  • the contact carrier 414 must be made of a special temperature and dimensionally stable material, which is costly and expensive and also restricts the selection of material candidates with regard to other desired material properties.
  • the membrane 404 for example as a sealing membrane made of silicone material, is inserted into the housing lower part 402 in order to be clamped between the contact carrier 406 and the housing lower part 402.
  • the socket contacts 410 pressed into the contact carrier 406 are additionally sealed from below.
  • the membrane 404 is a prefabricated silicone membrane, which is used as a single part in the manufacture of such a transducer.
  • the lower housing part 402 can be welded to the upper housing part 418 by means of ultrasound at the welding point 422 or can also be connected to the upper housing part 418 with adhesive or solvent.
  • welding by means of ultrasound makes it possible to achieve a high degree of tightness of the connection, it is very expensive, since it is necessary to ensure a tight connection of the upper housing part 418 and the lower housing part 402 of the transducer so that no liquid can penetrate into the transducer housing. This could in fact lead to an electrical connection between the contacts and to a drift of the pressure measuring signal.
  • the object of the present invention is thus to provide a component for the use of a fluid pressure measuring unit and a method for producing a component of a fluid pressure measuring unit, which enable a more cost-effective or less complicated method of production.
  • This object is achieved by a method of manufacturing a component of a fluid pressure measuring unit according to claim 1, a method of manufacturing a component of a fluid pressure measuring unit according to claim 3, a method of manufacturing a fluid pressure measuring unit according to claim 10 and a component for use in a fluid pressure measuring unit according to claim 13.
  • the method according to the invention for producing a component of a fluid pressure measuring unit comprises the following steps:
  • a measuring element with a measuring chip arranged on a first side of a chip carrier and a plurality of socket-shaped connection contacts for contacting contact connections of the measuring chip, wherein the socket-shaped connection contacts project from a second side of the chip carrier opposite the first side of the chip carrier;
  • a housing member having a plurality of receiving holes in a first side of the housing member, which are adapted to at an assembly of the housing element with the measuring element to receive the bush-shaped connection contacts, wherein the receiving holes extend from the first side of the housing element to a second side of the housing element opposite the first side of the housing element,
  • providing the housing member comprises injecting a sealing member to the first side of the housing member and / or injecting a closure member to the second side of the housing member to close the receiving holes on the second side of the housing member;
  • the method according to the invention for producing a component of a fluid pressure measuring unit comprises the following steps:
  • a measuring element with a measuring chip arranged on a first side of a chip carrier and a plurality of socket-shaped connection contacts for contacting contact connections of the measuring chip, wherein the socket-shaped connection contacts project from a second side of the chip carrier opposite the first side of the chip carrier,
  • step of providing the sensing element comprises electrically connecting solder terminals of the female terminals comprising with the contact terminals of the measuring chip by means of soldering;
  • a third aspect of the present invention includes a method of manufacturing a fluid pressure measuring unit, comprising the steps of:
  • Providing a fluid channel connection element which has a fluid channel with a connection opening for the fluidic coupling of the measuring element or a fluidic coupling of a gel surrounding the measuring chip with the fluid channel;
  • a fourth aspect of the present invention relates to a component for use in a fluid pressure measuring unit, the component having the following features:
  • a housing member having a plurality of receiving holes extending from the first side of the housing member toward a second side of the housing member opposite the first side of the housing member, the housing member having on the first side a sealing member integrally connected to the housing member , wherein a material of the sealing member is different from a material of the housing member, and / or wherein the housing member on the second side has a closure element for closing the receiving openings on the second side of the housing member, which is integrally connected to the housing member, wherein a material of the closure member is different from a material of the case member; and
  • a measuring element having a measuring chip arranged on a first side of a chip carrier and a plurality of socket-shaped connection contacts for contacting contact connections of the measuring chip, wherein the socket-shaped connection contacts project from a second side of the chip carrier opposite the first side of the chip carrier, the measuring element and the Housing element are constructed such that the measuring element and the housing member are fauxverbind- bar that protrude in an assembled state, the female terminal contacts in the receiving holes and the second side of the chip carrier of the first side of the housing element is opposite to the component for use in the Fluiddruckmes- unit to form.
  • the present invention is based initially on the recognition that a significantly simpler or cost-effective Manufacture is made possible when the need for using a cost-intensive and temperature and dimensionally stable material for the Buchsontontaufsacrificing or the contact carrier, are pressed into the socket contacts deleted.
  • the above finding is extended to the recognition that the freer selection of the material for the socket contact receiver makes it possible to form a one-piece socket contact receptacle and housing base, as it is also possible to inject the sealing element (for example as replacement of the O-ring) the first side of the housing element and / or an injection molding of a closure element (which replaces, for example, the silicone membrane) to the second side of the housing element is possible.
  • the sealing element for example as replacement of the O-ring
  • a closure element which replaces, for example, the silicone membrane
  • the above approach has the advantage that by eliminating the use of a large number of individual parts, such as the O-ring and / or the silicone membrane, a cost reduction due to the saving of manufacturing steps is possible.
  • the lower part of the housing can be used as a housing element made in one piece with the sealing element and the closure element be, which can be avoided by individual production steps for the preparation or provision of the housing element (such as the introduction of the predetermined contact carrier in the housing lower part).
  • Such an approach offers the advantage that it is now not necessary to accurately insert a sealing membrane plate into the housing base onto which the contact carrier is placed, but rather to seal the receiving holes in the housing element by simple sealing Injection can be produced. In this way, in turn, a cost reduction through the use of a simpler manufacturing step as a step of prefabricating the sealing membrane and the introduction of the prefabricated sealing membrane can be realized.
  • Another aspect complements the above discovery by recognizing that the free choice of material for the female contact receiver or housing bottom can be made possible when the female contacts are attached to the ceramic contact plate prior to inserting the female contacts into the female contact holes for the lower housing part, the use of a material for the housing element is possible, which makes no such high temperature and dimensional stability requirements necessary and is more advantageous in other respects, such as in terms of the cost of using materials with high temperature and dimensional stability.
  • the step of providing the housing element comprises forming a central opening between the receiving holes, the central opening extending from the first side of the housing element to the second side of the housing element, wherein the step of providing the measuring element provides Opening in the chip carrier under the measuring chip and wherein the step of assembly by means of the measuring element is performed with the housing member such that the central opening is in communication with the opening of the chip carrier and the measuring chip is fluidly connected to an external environment of the component of the fluid pressure measuring unit.
  • the step of providing the sensing element may include attaching a sensor dome to the first side of the chip carrier, wherein the sensor dome surrounds the sensing chip, and wherein the step of providing further comprises filling the sensor dome with a gel such that the sensing chip of the gel is covered.
  • the step of providing the housing element comprises injecting the closure element, wherein the provision of the housing element further comprises forming contacting holes in the closure element in the region of the receiving holes.
  • the contacting holes may be formed as through holes.
  • the provision of the holes offers the advantage that no pre-slitting of the closure element and no uncontrolled tearing of the closure element during insertion of contact pins for contacting the Transdu- is to be feared.
  • a ring-shaped or circular configuration of the contacting holes offers the advantage that the contact pins are better stripped off of contaminating liquids, such as saline solution, and the interior of the housing is better removed by such forms.
  • a blind hole offers the advantage that the interior of the opening with the socket-shaped terminal contacts during transport or generally after production is not contaminated until the first use. Furthermore, the formation of the hole can not be made only by cutting or punching, but also direct molding during injection molding is possible, which requires no extra cost or extra step. It is also possible to use a pre-slit blind hole which seals in an annular manner, but at the same time the slotted part is liquid-tight in the unmated state.
  • the step of providing the housing member comprises forming a base body with the receiving holes of a thermoplastic material, such as e.g. a polyolefin or another suitable for encapsulation with a second material plastic, and a molding of TPE for forming the sealing element and / or the closure element.
  • a thermoplastic material such as e.g. a polyolefin or another suitable for encapsulation with a second material plastic
  • TPE for forming the sealing element and / or the closure element.
  • the providing step may comprise injecting a sealing element, wherein the step of providing the housing element further comprises injecting a further sealing element separate from the sealing element to the first side of the housing element.
  • the injection molding step may also include injection molding of a sealing lip against a connection region between the housing element and a fluid channel. Include connecting element. The provision of such a molded and preferably circumferential sealing lip to the fluid channel connection element then offers the advantage of a structurally simple implementation of a seal between an upper and a lower sub-element of the fluid pressure measuring unit, so that, for example, a complex welding by ultrasound and a subsequent separate test no longer necessary.
  • the fluid channel connection element may have a fluid channel, which has a smaller cross section at a point in the region of the connection opening than at a further point, wherein in the region of the connection opening a viewing window is arranged in a wall of the fluid channel, which provides improved inspection of the measuring chip or allowing a gel surrounding the measuring chip from outside the fluid pressure measuring unit.
  • a cross-sectional distribution makes it possible to realize the venturi principle, so that the fluid flows faster in the area of the connection opening than in the area of the fluid channel at a location with a larger cross section.
  • such an arrangement has the advantage that can be ensured by the increased flow rate in the fluidically connected to the measuring sensor portion of the flow channel that no bubbles in this part are more likely to have settled during the initial filling of the piping system or during use on the measuring chip or on surfaces or edges in this area.
  • a window or a lens can also be arranged directly above the measuring chip, so that an area the flow channel, which is fluidly connected to the measuring chip or a gel, which surrounds the measuring chip, can be viewed from the outside enlarged.
  • FIG. 1A is a side view of a portion of a pressure measuring system, which represents an embodiment of the inventive component of a Fluid horrmes- unit;
  • FIG. 1B is a plan view of the component of a fluid pressure measuring unit shown in FIG. 1A; FIG.
  • FIG. 1C shows a sectional view of the embodiment of the component of the fluid pressure measuring unit illustrated in FIGS. 1A and 1B along the section line BA-BA illustrated in FIG. 1B in an enlarged representation
  • FIG. 1D shows a sectional view of the exemplary embodiment of the component according to the invention of a fluid pressure measuring unit illustrated in FIG. 1 along the section line BB-BB in an enlarged illustration
  • FIG. 2 is an enlarged perspective sectional view of the lower housing part or of the lower partial element of the fluid pressure measuring unit from FIG. IA-ID;
  • Fig. 3 is a schematic representation of a structure of an infusion system with pressure measurement
  • Fig. 4 is a cross-sectional view of a conventional transducer.
  • FIG. 1A shows a section of a pressure measuring system which has a transducer or pressure transducer 100.
  • the pressure transducer 100 can be installed in the pressure measuring system in such a way that it is arranged downstream of a flushing system (first tap) 102 and upstream of a second tap 104 in the direction of flow of the infusion solution.
  • the purging system 102 may be located toward an infusion solution reservoir while the second faucet 104 is connected between the transducer 100 and a patient, for example.
  • the purging system 102 may ensure that the transducer is protected from pressure fluctuations resulting from the infusion system and that a desired flow rate is ensured, while the second faucet 104 may be closed when performing actions on the patient, such as blood sampling.
  • the second tap is usable for "zeroing" the pressure sensor against atmospheric pressure.
  • FIG. 1B shows the arrangement shown in FIG. 1A from a different angle.
  • two lines of intersection by the transducer 100 namely the first section line BA-BA and the second section line BB-BB are already entered to explain the following figures IC and ID.
  • the section along the section line BA-BA runs through two bush-shaped connection contacts.
  • These connection contacts (which are not visible in FIG. 1B) form the connection contacts of a Wheatstone measuring bridge, but the two contacts shown in more detail below along the section line BA-BA represent only two contacts of the Wheatstone measuring bridge.
  • Two further contacts of the Wheatstone measuring bridge are arranged diagonally to the connection contacts present along the section line BA-BA, ie four contacts of a Wheatstone measuring bridge are arranged in regions 110, which however is not directly apparent from FIG. 1B.
  • FIG. 1B shows how a flow channel 120 narrows in the region of the transducer 100 or of the fluid pressure measuring unit, as corresponds to the Venturi principle.
  • FIG. 1B can also be a viewing window in the narrowed part of the flow channel 120 in the form of a magnifying glass, so that an optically magnified visible area, preferably on the measuring chip, can be realized, whereby then through a Users of the transducer 100 can be checked whether bubbles have settled over the measuring chip in the flow channel.
  • the transducer has an upper subelement 150 (fluid channel connection element) which forms part of the flow channel 120 and an upper housing cover of the transducer 100 forms. Furthermore, it can be seen from FIGS. 1C and 1D that the internal structure of the transducer 100 is also made up of a large number of components which, for illustrative reasons, will be described in more detail with reference to FIG.
  • FIG. 2 shows a perspective cross-sectional view of a portion of the transducer 100, as shown in Fig. IC.
  • FIG. 2 shows the assembled or finished lower partial element of the transducer 100.
  • FIG. Housing element For the sake of clarity, the construction of the lower subelement illustrated in FIG. Housing element explained, what then its production will be explained with reference to an embodiment.
  • the lower element of the transducer 100 shown in FIG. 2 has a chip carrier 200 in its finished state, on the first side of which a sensor 202 is arranged or fastened.
  • the chip carrier 200 may be a hybrid ceramic with printed conductors and resistors.
  • an integrated circuit (chip) may be used for the sensor 202.
  • a sensor dome 204 is likewise arranged on the first side of the chip carrier 200, so that a wall of the sensor dome 204 projecting from the chip carrier 200 surrounds the sensor 202.
  • a gel filling which is filled for example in a recess 206 formed by the sensor dome 204 and the chip carrier 200, in which the sensor 202 is located to cover the sensor 202.
  • the lower subelement shown in FIG. 2 has socket contacts 208 with solder tails 210 and contact springs 212.
  • the solder tails may either extend to the first side of the chip carrier or extend only to the second side of the chip carrier. In Fig. 2, only the former option is shown.
  • the sensor dome is preferably filled with a gel that seals the sensor 202 fluid-tight from the fluid channel, but a Pressure transmission allows.
  • the socket contacts 208 are mounted on one of the first side of the chip carrier 200 opposite second side of this.
  • the socket contacts are arranged in each case in an opening 214 of the housing base 216.
  • the opening 214 of the housing base 216 extends from a first side of the housing base 216 to a second side opposite the first side of the housing base 216.
  • a central opening 220 is further arranged, which serves as a ventilation hole for the sensor chip 202.
  • a sealing element 240 is injection-molded on the lower housing part 216.
  • the injection-molded sealing membrane 222 has a blind hole 224 in the middle region. In a blind hole, the closed area can be punched through to allow passage.
  • a through hole may be formed in the molded sealing membrane 222, which is not shown in Fig. 2.
  • the lower housing part 216 can have, at a transition 226, a molded-on seal 228, which serves as a sealing lip when joining the lower subelement shown in FIG. 2 to the upper subelement 150 of the transducer shown in FIG.
  • the sealing lip 228 may preferably also consist of TPE, so that the lower housing part can be made in one piece with all required sealing elements.
  • Also acting as a replacement of the O-ring sealing element 240 may be made of a TPE material.
  • the chip carrier 200 with the measuring chip 202 and the socket contacts 208 arranged thereon is now initially involved the solder tails 210 provided.
  • the solder tails are soldered to contact terminals on the chip carrier 200, wherein the contact terminals enable a contacting of the chip 202 arranged on the chip carrier 200 or are electrically conductively connected to corresponding chip pads.
  • the soldering is carried out with bending or with already pre-bent solder tails 210 such that the socket contacts 208 protrude therefrom on a second side of the chip carrier, while the chip 202 and the contact terminals on the opposite first side of the chip carrier 200 are arranged.
  • the chip carrier can also be provided with conductor tracks or plated-through holes in such a way that the contact terminals 210 are arranged on the second side of the chip carrier.
  • the sensor dome 204 can be attached (for example glued on). Finally, it is preferable to fill the sensor dome with a gel such that the gel surrounds the measuring chip 202 (in FIG. 2, however, the gel is not shown in the sensor dome for purposes of illustration).
  • the measuring chip 202 can now be "packaged" in a fluid-tight manner by the gel so that no conductive liquid, such as, for example, the infusion solution comes into direct contact with the measuring chip or with printed conductors on the chip carrier 200 and thus falsifies the measured values
  • a measuring element consisting of the chip carrier 200, the sensor 202, the female contacts 208 and the sensor dome 204 and the gel filling has been produced.
  • the sealing lip 228, a sealing membrane 222 and / or a seal 240 can be injection-molded onto the lower sub-element 216 in a connecting region.
  • Many different variants for such spraying are available, which can be used in particular at low cost.
  • the measuring element generated as described above consisting of the chip carrier 200, the sensor 202, the socket contacts 208 and the sensor dome 204 with the filling of the sensor dome is then joined together with the lower sub-element 216, for example, pressed.
  • the socket contacts 208 can be inserted directly into the openings 214, resulting in the structure shown in Figure 2.
  • a loose insertion of the measuring element into the housing element can take place, so that the female contacts in the openings 214 have some play, wherein a pressing and thus sealing the sealing element 240 to the chip carrier 200 by a subsequent compression of the housing member 216 to the Fluid channel connecting element 150, which is not shown in Fig. 2, takes place. This produces the component of the fluid pressure measuring unit.
  • the component of the fluid pressure measurement unit thus produced is intended to be attached to the upper subelement 150 (ie, the fluid channel connector) such that the sensor 202 is fluidly connected to the flow channel 120 via the gel fill and transfers pressure fluctuations of a fluid in the flow channel 120 the gel filling is transferred to the measuring chip 202.
  • the adhesive or adhesion surface between the measuring element and the upper partial element 150 can lie, for example, between the sensor dome 204 and the upper partial element 150 and ensure a seal of an intermediate space 242 in the lower partial element.
  • the bonding of the upper subelement 150 to the lower subelement 216 may, for example, take place by gluing such that an outer side wall 230 shown in FIG. 2 is provided with adhesive material and joined to the transducer cover or shroud illustrated in FIGS. Channel attachment 150 is joined together.
  • a snap closure or a screw cap can be used in which by compressing the o- Beren and lower sub-element and the associated compression of the sealing lip 228 creates a fluid-tight connection between these two sub-elements and a seal of the interior 242.
  • the sensor dome 204 should not be rectangular but circular, as shown in FIG.
  • the above-described embodiment of the method according to the invention offers the advantage that the socket contacts no longer have to be pressed into the contact carrier, then an O-ring is placed on the contact carrier and then the chip carrier in the form of the hybrid ceramic is placed on the soldering tabs and soldered, which has a high thermal or stability impact on the contact carrier. Also, a cost advantage can be realized by the one-piece production of the housing base 216 with all required seals in the two-component process.
  • a sealing element 240 comparable to the O-ring between the contact carrier or housing base 216 on the one hand, and the chip carrier 200 on the other hand can be realized, as is possible, for example, with the sealing element 240 shown in FIG.
  • This sealing element 240 can serve to seal the socket contacts 208 relative to the interior 242.
  • the sealing element 240 can also serve as a seal between the cavity formed by the central hole 220 and the chip carrier 200, so that the inner space 242 and the socket contacts 208 in the bores 214 are sealed against each other and against the center hole 220.
  • an opening in the chip carrier can also be provided in the region of the center hole 220 200, so that an ambient air pressure of the ambient air can pass directly to a rear side of the measuring sensor, whereby a calibration of the measuring sensor 202 in different operating environments is made possible because the pressure-sensitive membrane of the sensor (not shown) on both sides open or is exposed, so that there is no bias of the membrane at both sides fitting atmospheric pressure.
  • the contacting can take place either by piercing the contact electrode through the blind hole 224 or, if the hole is in the form of a through hole, the contacting can be done by passing through the contact through this through hole.
  • the socket contacts in the lower housing part have some play. Since the soldering process is no longer in connection with the contact carrier or the lower housing part, the lower housing part can be manufactured in one piece.
  • the materials can for example be chosen so that the lower housing part can be manufactured as a two-component part (for example, a special combination of the material of the lower housing part (such as polypropylene) and a material for molding the gaskets (such as TPE), in which case the lower housing part
  • the contact carrier, the sealing membrane and the O-ring as well as the sealing lip are preferably formed as a single part, moreover, ultrasonic welding is no longer necessary because the tightness between the upper and lower housing parts can preferably be achieved by a likewise molded sealing lip.

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  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Hematology (AREA)
  • Vascular Medicine (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Physics & Mathematics (AREA)
  • Heart & Thoracic Surgery (AREA)
  • General Physics & Mathematics (AREA)
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  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Measuring Fluid Pressure (AREA)

Abstract

L'invention concerne un procédé de fabrication d'un composant d'une unité de mesure de la pression d'un fluide, et un composant destiné à être utilisé dans ladite unité. Le procédé de fabrication d'un composant d'une unité de mesure de la pression d'un fluide (100) comprend l'étape consistant à prévoir un élément de mesure présentant une puce de mesure (202) disposée sur une première face du support de puce (200) et une pluralité de contacts de connexion du type connecteur femelle (208) destinés à la mise en contact des connexions de contact de la puce de mesure (202), lesdits contacts de connexion (208) étant en saillie à partir d'une seconde face du support de puce (200) opposée à la première face dudit support de puce (200). En outre, le procédé selon l'invention comprend l'étape consistant à prévoir un élément de boîtier (216) présentant une pluralité de trous de positionnement (214) dans une première face de l'élément de boîtier (216), lesdits trous étant configurés pour recevoir, lors de l'assemblage de l'élément de boîtier (216) avec l'élément de mesure, les contacts de connexion du type connecteur femelle, les trous de positionnement (214) s'étendant de la première face de l'élément de boîtier vers une seconde face de l'élément de boîtier (216) opposée à la première face dudit élément de boîtier (216), l'étape de la production de l'élément de boîtier (216) consistant à injecter un élément d'étanchéité (240, 228) sur la première face dudit élément de boîtier (216) et/ou à injecter un élément de fermeture (222) sur la seconde face dudit élément de boîtier (216), en vue d'obturer les trous de positionnement sur la seconde face de l'élément de boîtier (216). Le procédé selon l'invention comprend, comme étape finale, l'assemblage de l'élément de mesure et de l'élément de boîtier (216), de telle façon que la second face du support de puce (216) soit opposée à la première face de l'élément de boîtier (216), les contacts de connexion du type connecteur femelle (208) étant disposés dans les trous de positionnement (214), en vue de produire les composants de ladite unité de mesure de pression de fluide (100). La production en une seule pièce de l'élément de boîtier (216) avec les élément d'étanchéité injectés (membrane d'étanchéité (222), lèvres d'étanchéités (228) et joint torique (240)) permet de réduire d'une part, des étapes du procédé et, d'autre part, le nombre de composants séparés.
PCT/EP2007/001592 2006-02-24 2007-02-23 Procédé de fabrication d'une unité de mesure de la pression d'un fluide, et composant destiné à être utilisé dans ladite unité. WO2007098893A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE502007002925T DE502007002925D1 (de) 2006-02-24 2007-02-23 Verfahren zum herstellen einer fluiddruckmesseinheit und komponente zum einsatz in einer fluiddruckmesseinheit
EP07711654A EP1989523B1 (fr) 2006-02-24 2007-02-23 Procédé de fabrication d'une unité de mesure de la pression d'un fluide, et composant destiné à être utilisé dans ladite unité.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006008752.6 2006-02-24
DE102006008752A DE102006008752B4 (de) 2006-02-24 2006-02-24 Verfahren zum Herstellen einer Komponente einer Fluiddruckmesseinheit, Verfahren zum Herstellen einer Fluiddruckmesseinheit, Komponente zum Einsatz in einer Fluiddruckmesseinheit sowie Fluiddruckmesseinheit

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WO2007098893A1 true WO2007098893A1 (fr) 2007-09-07

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PCT/EP2007/001592 WO2007098893A1 (fr) 2006-02-24 2007-02-23 Procédé de fabrication d'une unité de mesure de la pression d'un fluide, et composant destiné à être utilisé dans ladite unité.

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US (1) US7373826B2 (fr)
EP (1) EP1989523B1 (fr)
DE (2) DE102006008752B4 (fr)
WO (1) WO2007098893A1 (fr)

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Also Published As

Publication number Publication date
EP1989523B1 (fr) 2010-02-24
US7373826B2 (en) 2008-05-20
DE502007002925D1 (de) 2010-04-08
EP1989523A1 (fr) 2008-11-12
US20070209449A1 (en) 2007-09-13
DE102006008752B4 (de) 2012-11-29
DE102006008752A1 (de) 2007-09-06

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